Method of making dobby cord terminals



May 6, 1941.

B. T. CLARK METHOD OF MAKING DOBBY CORD TERMINALS Filed June 22, 1959 Patei lted I May 6, 1941 UNITED STATES PATENT OFFICE METHOD OF MAKING DOBBY CORD TERMINALS Application June 22, 1939, Serial No. 280,509

3 Claims.

My present invention relates to dobby cords and is directed to improve and perfect a die-cast type of dobby cord such,as is shown in my prior and copending applications Ser. Nos. 252,581, filed Jan. 24, 1939, and 271,193, filed May 1, 1939, which constitute improvements on the die-cast dobby cord terminal construction of Patent No. 2,152,397, dated March 28, 1939.

The advantages of die-casting a terminal at each end of a dobby cord are now well recognized, and the important features of my said pending improved i constructions and methods consist in the utilization of a hardened steel, wear-resisting eyelet, U-shaped, or hook member united and bonded with both the wire core, or heart, and with a braided sheath or covering.

My present invention aims to improve and perfect this feature and to provide a terminal structure particularly suited for the die-casting operation, although it can be likewise formed by a hot metal molding or welding operation.

In the present construction I provide the wearresistant hardened steel or loop member with a pair of extending shanks or arms adapted to lay in close contact with the projecting end of the reinforcing wire core of a dobby cord, such as is shown in my said prior applications, and thereupon to firmly bond the extending arms and wire together by flowing a mass of molten metal therearound, preferably by the quick and simple die-cast method.

A further and important feature consists in an arrangement whereby my present improvement has cooperating means to bind the two arms of the eyelet member with the core, as well as to interlock the said arms and the molten metal used for the bonding action.

Incarrying out this latter feature, I prefer to preform the extending arm members with grooves or other irregularities which will permit the molten metal to flow therein and thus firmly to interlock same with the metal as in die-casting, welding, molding, or the like, as well also as to more firmly bind the arms of the eyelet member to and about the reinforcing wire core.

A further important feature consists in the snugness and compactness with which my dobby cord terminal can be embodied, by having the plurality of arms of the eyelet member straddling and telescoping with the projecting wire of the reinforcing core, and thus also save the quantity of die-cast metal employed.

While I may, if desired, utilize one extending arm or portion from the eyelet and interlock same with the reinforcing wire core, I prefer to utilize two or more extending arms from the eyelet member which straddle and interlock with the wire of the cord.

Referring to the drawing illustrating preferred embodiments of my present invention,

Fig. 1 is a view illustrating the assembly of the terminal members;

Fig. 2 is a cross-sectional view illustrating the completion of the union between the eyelet member and the dobby cord end by molten metal, as by die-casting; and

Fig. 3 illustrates the completed terminal.

As shown in the drawing, a dobby cord section comprising a braided sheath l and a wire core 2 of the usual type is prepared by removing a portion of the sheath I from the end to expose the projecting wire core 2. An eyelet member 3, having a U-shaped contour, with a pair of depending arms 4 and 5, and preferably with the arm formed of corrugations or the like, as indicated at 66 and 1-1 for better interlocking with the molten metal to be supplied therearound, is fitted about the projecting wire core 2, as shown in Fig. 1.

Thus, the arms of the U-shaped member straddle the projecting core 2 and, if desired, the end part of the wire 2 as indicated at 8 may be flared or hammered out to give a still further interlocking action with the U-shaped member. Thereupon, a mass of molten metal I0 is applied either by molding, welding or, preferably, by diecasting the same about the interlocked arms 4 and 5 of the member 3 flowing in, around, and about the same and into the corrugated portions, both of the wire core 2 and the ridges and grooves B and I in the arms 4 and 5, as well also as covering the end part of the dobby cord sheath I, providing a ferrule I2 therefor and completing the terminal.

Thus, a more compact, strong, firm, rigid interlocking construction is obtained, firmly binding the wear-resisting member 3 directly to the wire core 2 and to the enclosing sheath I. This terminal is applied to each end of the dobby cord, as will be readily understood.

It will be noted that I have obtained a strong, compact, firm interlocking construction with the hook, eyelet, or U-shaped member of wear-resisting material, preferably hardened steel, and with the same having a shank, or shanks, in direct contact with the wire core of the dobby cord 6 exposed for an appropriate length for such interlocking and the completion of the union between the eyelet, hook, or U-shaped member and the dobby cord being affected by simultaneously uniting the same with molten metal I 0 and forming a ferrule I2, thus providing a complete finished terminal.

I claim:

1. The improved process of making a dobby cord with a hardened metal terminal on an end, said cord comprising a reinforcing wire core and an encircling textile sheath, which consists in removing a part of the sheath from the end exposing the wire core, providing an eyelet member of hardened metal, having a plurality of separate shank portions, assembling said eyelet and cord and thus prepared by telescoping the shank portions about the exposed wire and in contact with said wire, leaving said wire exposed between said separate shank portions, and thereupon bonding the shank and wire by applying molten metal under pressure on the outside of both the shanks and exposed wire portions.

2. The improved process of making a dobby cord with a hardened metal terminal on an end, said cord comprising a reinforcing wire core and an encircling textile sheath, which consists in removing a part of the sheath from the end exposing the wire core, providing an eyelet member of hardened metal, having a plurality of separate shank portions, assembling said eyelet and cord end thus prepared by telescoping the shank portions about the exposed wire and in contact with said wire, leaving said wire exposed between said separate shank portions and with the extreme end portion of said wire extending into the eyelet part, holding the shank portions in contact with said wire and riveting the extreme end wire over the adjacent eyelet portion, and thereupon diecasting a mass of molten metal around the outside of said separate shanks and exposed portions over said riveted part and around the adjacent braided part to constitute a. ferrule.

3. The improved process of making a dobby cord with a hardened metal terminal on an end, said cord comprising a reinforcing wire core and an encircling textile sheath, which consists in removing a part of the sheath from the end exposing the wire core, providing an eyelet member of hardened metal, having a plurality of separate shank portions, each shank portion having its outer surface formed with an uneven contour for interlocking with molten metal, assembling said eyelet and cord end thus prepared by telescoping the shank portions about the exposed wire and in contact with said wire, leaving said wire exposed between said separate shank portions, thereupon bonding the shank and wire by applying molten metal under pressure on the outside of both the shanks and exposed wire portions, and in contact with both the shank and wire throughout the extent of their telescoping contact.

BRECKINRIDGE T. CLARK. 

